Standard Imaging MAX 4000 PLUS Manual de usuario

MAX 4000 PLUS ELECTROMETER

REF 90020

U S E R M A N U A L

See MAX COMM™ Software package for installation CD-ROM

Standard Imaging, Inc. // 3120 Deming Way // Middleton, WI 53562 USA

TEL 608.831.0025 // TEL 800.261.4446 // FAX 608.831.2202

www.standardimaging.com

MAX 4000 PLUS ELECTROMETER 2

General Precautions

Warnings and Cautions alert users to dangerous conditions that can occur if instructions in

the manual are not obeyed. Warnings are conditions that can cause injury to the operator,

while Cautions can cause damage to the equipment.

WARNING: Proper use of this device depends on careful reading of all instructions

and labels.

WARNING: An electrical shock hazard of up to 450 VDC is possible whenever the

bias voltage is active. Always set the bias to 0 VDC whenever a device is connected

to or disconnected from the MAX 4000 Plus.

WARNING: Electric shock hazard. Refer servicing to a qualified individual.

WARNING: The MAX 4000 Plus is not intended to be used in flammable mixture

atmospheres. Do not use with flammable anesthetic mixture with air, with oxygen,

or nitrous oxide.

WARNING: Where applicable, Standard Imaging products are designed to be used

with the versions of common radiation delivery devices, treatment planning

systems and other products or systems used in the delivery of ionizing radiation,

available at the time the Standard Imaging product is released. Standard Imaging

does not assume responsibility, liability and/or warrant against, problems with the

use, reliability, safety or effectiveness that arise due to the evolution, updates or

changes to these products or systems in the future. It is the responsibility of the

customer or user to determine if the Standard Imaging product can be properly

used with these products or systems.

CAUTION: Input voltage on triax connector should be no greater than +5 V or -5 V.

CAUTION: Only connect the RS-232 serial port to equipment where no risk of

external voltage exists.

CAUTION: This device should never be submerged in water or a solvent to clean, or

scrubbed with an abrasive cleaner. Do not drop or mishandle unit. Calibration factor

changes may result.

CAUTION: Do not disassemble unit since it may result in change of calibration

factor. Refer servicing to qualified individuals.

CAUTION: Damaged or kinked ionization chamber cables or extension cables

should not be used.

CAUTION: Upon power on, allow for proper warm up.

CAUTION: Charge measurements made in modes other than those used by the

calibration agency may result in measurement errors which exceed the calibration

uncertainty.

CAUTION: When connecting or disconnecting an ionization chamber to the MAX

4000 Plus, set the bias voltage to 0 VDC.

CAUTION: This user manual refers only to MAX 4000 Plus units. Refer to reference

number 80206 for MAX 4000 units.

CAUTION: For best performance, select the lowest range possible for the intended

measurement.

MAX 4000 PLUS ELECTROMETER 3

CAUTION: Use provided power supply or equivalent as identified by Standard

Imaging. Contact Standard Imaging for additional information.

CAUTION: To ensure long-term performance of the internal battery, it is

recommended to fully recharge the MAX 4000 Plus Electrometer monthly.

CAUTION: Cybersecurity is a shared responsibility between Standard Imaging and

the customer. Secure use of this product is dependent upon the proper utilization

of passwords, firewalls, networks, computer platforms, operating systems and data

storage.

CAUTION: The MAX series electrometer may contain additional commands and

settings not available and/or not compatible with the MAX COMM Software or the

DoseView 1D Software. When using these software products, do not use the front

panel buttons of the electrometer to change the settings.

MAX 4000 PLUS ELECTROMETER 4 
Table of Contents 
General Precautions................................................................................................................................................................................ 2 
Table of Contents.......................................................................................................................................................................................4 
1General Operation ......................................................................................................................................................................... 5 
2Front Panel..........................................................................................................................................................................................6 
3Rear Panel ............................................................................................................................................................................................ 7 
4Setting up the MAX 4000 Plus .............................................................................................................................................7 
4.1 Warm Up and Zero Adjustment .............................................................................................................................. 7 
4.2 Range Selection Mode.....................................................................................................................................................8 
4.3 Bias Mode ..................................................................................................................................................................................8 
4.4 Trigger Mode Threshold Levels .................................................................................................................................8 
4.5 System Zeroing .....................................................................................................................................................................9 
5Using the MAX 4000 Plus.........................................................................................................................................................9 
5.1 Charging the internal battery ....................................................................................................................................9 
5.2 Automatic shutdown......................................................................................................................................................10 
5.3 Charge Mode & Rate/Charge Mode.....................................................................................................................10 
6MAX COMM™ Software ............................................................................................................................................................12 
7Maintenance .....................................................................................................................................................................................12 
8Description of Symbols .............................................................................................................................................................13 
9Parts and Accessories List .......................................................................................................................................................13 
10 Troubleshooting ............................................................................................................................................................................14 
10.1 Questionable Readings.................................................................................................................................................14 
10.2 Can’t Get Out of Charge Mode or Rate/Charge Mode............................................................................15 
10.3 No Response...........................................................................................................................................................................15 
10.4 Avoiding Electromagnetic or Other Interference ......................................................................................15 
10.5 Low Battery .............................................................................................................................................................................15 
10.6 Threshold Mode - False Triggering........................................................................................................................15 
11 Features and Specifications.................................................................................................................................................. 16 
12 WARRANTY STATEMENT- 4424-18..................................................................................................................................18 
13 Serialization Information........................................................................................................................................................20 
14 Customer Care Policy Statement....................................................................................................................................20 
15 Customer Responsibility ..........................................................................................................................................................21 
16 Service Policy ...................................................................................................................................................................................23 
17 Return Policy....................................................................................................................................................................................23 

MAX 4000 PLUS ELECTROMETER 5

1General Operation

1. Unless operating on battery power, connect the detachable AC power cord to the provided

Globtek®, Inc. power supply, attach the AC power cord to a grounded 120 VAC or 220/240 VAC

50/60 Hz power outlet, and connect the power supply to the MAX 4000 Plus Electrometer

power adapter input.

2. With nothing connected to the input connector of the MAX 4000 Plus, turn the power on

and wait at least 10 minutes for the electrometer to warm up.

3. Select the desired Range of Operation, Low or High, with the arrow buttons, followed by the

MODE/ZERO button.

NOTE: For best performance, select the lowest range possible for the intended measurement.

4. Press the Start button to perform the electrometer zero adjustment. This will take about

one minute.

5. Connect the ionization chamber to the MAX 4000 Plus and select the desired voltage bias.

Allow at least 10 minutes for the system to stabilize.

6. Verify the leakage of the ionization chamber is within the manufacturer’s stated acceptable

limits.

7. Press and hold the MODE/ZERO button and repeat the zeroing process in Step 3, but with

the ionization chamber connected. This is the system zero adjustment.

8. Check the system leakage. Take a reading without exposing the chamber to radiation. This

reading should be less than 0.1% of the final signal expected.

9. Measure the atmospheric temperature and pressure.

10. Turn on or insert the radiation source(s) and take at least 3 measurements. Further

explanation of the Range, Trigger, Rate, Charge, and Rate/Charge modes can be found on

pages 5-8.

11. Analyze the data taking into account the average of the readings, system leakage,

temperature/pressure corrections, calibration factors and any other appropriate corrections to

be made.

12. When all measurements are completed, set bias voltage to 0 VDC, turn off the MAX 4000

Plus and disconnect the ionization chamber.

13. If using the power supply and if desired, disconnect the power supply from the MAX 4000

Plus and disconnect the detachable AC power cord from the power supply.

MAX 4000 PLUS ELECTROMETER 6

2Front Panel

1Power/Standby LED: When lit, the MAX 4000 Plus is powered on.

2Power button: Turns the unit on/off.

3Battery Charging LED: When lit, the battery charger is energized and charging the internal

battery.

4Input connection: A standard two lug, BNC, triax connector for signal input. This connector

features low leakage current properties. The signal current is carried on the central lead, the

guard carries the high voltage and the outermost ring is ground.

0-450 VDC / 350 µA max

To protect the input connector, always replace the chain cap when the MAX 4000 Plus is not

in use.

5MODE/ZERO button: Press to toggle through the modes in the following order: Range, Bias,

Threshold Levels, Rate, Charge and

Rate/Charge. Press and hold for 2 seconds to select the zero adjustment procedure and

perform system zero.

6START/RESET button: Press to start and stop timed charge collections in the Charge or

Rate/Charge mode, or to reset the display following a collection.

7Arrow buttons: Press to toggle the Range selection, voltages in the Bias Mode, or to select

the time period increments for taking a charge reading.

MAX 4000 PLUS ELECTROMETER 7

3Rear Panel

1External reset switch: In the unlikely event that the device stops responding, use a small

diameter rod to lightly press the internal button and reset the device.

2RS-232 serial port: A standard 9-pin serial port for remote observation or data recording. This

port is for connection to equipment where no risk of external voltage exists.

3 2.1 mm Battery Charger Input: Connect the battery charger to this input jack when charging

the internal battery. Note: If the MAX 4000 Plus is being used in a patient environment, do not

plug in the charger. Connect to mains power through an isolation transformer only.

4Setting up the MAX 4000 Plus

Before using the MAX 4000 Plus to take measurements, perform the following steps to ensure

accurate readings. The MAX 4000 Plus features an automatic zero function and a convenient

way to check battery status and bias level.

4.1 Warm Up and Zero Adjustment

1. Turn on the MAX 4000 Plus. Allow the unit to warm up for a minimum of 10 minutes. This

allows the temperature of the internal components to stabilize, and will help prevent the

measurements from drifting. If you choose to take measurements without warming up, be

aware that repeatability and leakage specifications may not be achieved until 10 minutes has

elapsed.

2. Select the desired Range of Operation, Low or High, with the arrow buttons, followed by the

MODE/ZERO button. Press the Start button to perform the zero adjustment. This process will

take 60 seconds.

MAX 4000 PLUS ELECTROMETER 8

3. The display will read “ZEROING COMPLETE.” The MAX 4000 Plus now defaults to the Bias

Mode.

NOTE: Each Range of Operation must be zeroed upon initial use. To perform subsequent zero

adjustments, press and hold the MODE/ZERO button for two seconds.

4.2 Range Selection Mode

1. The measuring range of the MAX 4000 Plus is displayed as High or Low. The actual numeric

range is also shown to indicate the proper units of measurement for each range.

NOTE: For best performance, select the lowest range possible for the intended measurement.

2. Use the arrow buttons to select the desired range of operation. Range change is immediate.

3. Use the MODE/ZERO button to select mode of operation. You may use the MODE/ZERO

button to return to the range selection mode at any time.

4.3 Bias Mode

1. The charge level of the internal battery is displayed in percent. When the battery capacity

drops below 15%, the display will read “RECHARGE BATTERY.”

2.Use the arrow buttons to select the bias level from the following options:

-450 VDC

-400 VDC

-350 VDC

-300 VDC

-250 VDC

-200 VDC

-150 VDC

-100 VDC

0 VDC

100 VDC

150 VDC

200 VDC

250 VDC

300 VDC

350 VDC

400 VDC

450 VDC

3. Press the MODE/ZERO button to select a mode of operation. You may return to the Bias

Mode at any time to change the bias voltage.

CAUTION: When connecting or disconnecting an ionization chamber to the MAX 4000

Plus, set the bias voltage to 0 VDC.

4.4 Trigger Mode Threshold Levels

The MAX 4000 Plus Electrometer has a trigger mode, which allows it to automatically detect

the start and stop of a radiation exposure by measuring the current crossing predetermined

MAX 4000 PLUS ELECTROMETER 9

limit thresholds. The start and stop thresholds are set independently, with the default settings

of start 0.8 pA and stop 0.5 pA. Threshold limits cannot be set to 0.0. When making

measurements in the presence of larger leakage currents, it may be necessary to raise the

threshold limits. Conversely, since the start threshold determines the minimum dose rate, it

may be necessary to lower the thresholds for other measurements.

1. The threshold start and stop levels are displayed in pA and are adjustable from 0.01

- 9.99 pA.

2. Use the START/RESET button to select the digit to adjust.

3. Use the arrow buttons to adjust the selected digit from 0 to 9.

4. Both values must be larger than zero, and the start value must be larger than the

stop value.

5. Use the MODE/ZERO button to select mode of operation. You may use the

MODE/ZERO button to return to the Threshold Levels mode at any time.

6. If invalid numbers are entered, the invalid entry will be displayed after pressing the

MODE/ZERO button.

4.5 System Zeroing

1. Connect the ionization chamber to the MAX 4000 Plus and select the desired

voltage bias. Allow at least 10 minutes for the system to stabilize.

2. Verify the leakage of the ionization chamber is within the manufacturer’s stated

acceptable limits.

3. Press and hold the MODE/ZERO button for 2 seconds to repeat the zeroing

process, but with the ionization chamber connected. This is the system zero

adjustment.

5Using the MAX 4000 Plus

5.1 Charging the internal battery

1. When the battery capacity is 15% or less, “RECHARGE BATTERY” appears on the

display. Plug the 2.1 mm plug of the charger into the electrometer and the

other end into mains power.

2. Whenever external power is supplied, the small amber light adjacent to the

POWER button on the front panel is lit. This activates the charging circuit and

the Battery percent display in the Bias Mode will indicate “CHRG”.

3. The MAX 4000 Plus will also operate with the charger plugged into a wall outlet,

regardless of the battery capacity. Re-charging the battery takes 6 - 8 hours. The

MAX 4000 Plus may be continually charged with no detrimental effects to the

internal battery.

4. To ensure long-term performance of the internal battery, it is recommended to

fully recharge the MAX 4000 Plus Electrometer monthly.

MAX 4000 PLUS ELECTROMETER 10

5.2 Automatic shutdown

To maximize battery life, the MAX 4000 Plus will shut off automatically if it is not plugged into

the wall charger and is left unattended for more than 3 hours.

Rate Mode

1. Use the Range mode to select the range of operation.

2. Use the Bias Mode to set the bias voltage.

3. Use the MODE/ZERO button to select the Rate Mode.

4. Irradiate the ion chamber with a radioactive source.

5. The MAX 4000 Plus will begin to measure the current. For signals 2 nA and

below, allow about 12 seconds for the signal to stabilize. For signals above 2 nA,

wait about 3 seconds for stabilization.

6. The Rate measurement will be displayed.

NOTE: Rate measurements over 500.00 nA (High range) or 1000.0 pA (Low range) will produce

an “OVERLOAD” message.

5.3 Charge Mode & Rate/Charge Mode

1. Use the Range mode to select the range of operation.

2. Use the Bias Mode to set the bias voltage.

3. Use the MODE/ZERO button to select the Charge Mode or Rate/Charge Mode.

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