4700 Refrigerated Sampler Service Guide
Section 5 Electrical Troubleshooting and Diagnostics
5-8
Note
Should there be a loss of AC power and the internal battery’s
no-load voltage is below 2.2 VDC, the sampler might lose data
and settings from its memory. It is recommended that you
retrieve the data and record the program and configuration set-
tings in case of memory loss.
5.1.12 Loaded Battery Voltage
The
LOADED BATTERY VOLTS
diagnostic displays the loaded DC
voltage supplied by the Main CPU board’s internal battery. A
loaded test provides a better indication of battery performance.
When this test is started, the sampler will display the voltage
with a 20K
load at one second intervals. The test continues for
15 seconds or until you press the Enter button to abort the test.
Note
Repeated use of the Loaded Battery Volts diagnostic will
shorten the battery life.
To display the loaded battery voltage:
1. Select the
LOADED BATTERY VOLTS
option and press
Enter.
2. The display shows the voltage at 1 second intervals for 15
seconds. You can abort the test by pressing the Enter but-
ton.
The voltage reading is normally between 2.4 and 3.1 VDC. If the
voltage is below 2.4 VDC, the internal battery should be
replaced. Contact your authorized Isco service facility or the
Teledyne Isco factory for assistance.
Note
Should there be a loss of AC power and the internal battery’s
loaded voltage is below 2.2 VDC, the sampler might lose data
and settings from its memory. It is recommended that you
retrieve the data and record the program and configuration set-
tings in case of memory loss.
5.1.13 Display Analog Input
The
ANALOG INPUT
diagnostic displays the 4-20 mA current
loop input to the sampler. This diagnostic tool is helpful when
troubleshooting an analog input from a flow measurement
device.
When you start this test, the sampler will display the current
reading until you press the Stop or Enter button. There is no
pass or fail.
To display the analog input current:
1. Select the
ANALOG INPUT
option and press Enter.
SELECT DIAG: (<-->)
LOADED BATTERY VOLTS
LOADED BATTERY VOLTS
__._ V
SELECT DIAG: (<-->)
ANALOG INPUT
Summary of Contents for 4700
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Page 6: ...Isco 4700 Refrigerated Sampler Service Guide Safety iv ...
Page 12: ...4700 Refrigerated Sampler Service Guide Table of Contents x ...
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Page 60: ...4700 Refrigerated Sampler Service Guide Section 2 Sample Delivery System 2 30 ...
Page 108: ...4700 Refrigerated Sampler Service Guide Section 4 CPU and Power Supply 4 26 ...
Page 124: ...4700 Refrigerated Sampler Service Guide Appendix A Electrical Diagrams A 2 ...
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Page 128: ...4700 Refrigerated Sampler Electrical Wiring A 6 Figure A 5 4700 CPU schematic diagram ...
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