Fluke Biomedical 945A - Manual (Page 72)

Troubleshooting / Adjustments
Error Codes E0011 & E0012
If error code E0011 is displayed on the UDR, determine if the high voltage is present in the detector
through the use of the test points described in the following paragraphs. E0011 will also be displayed if
the level of HV is not sufficient for proper detector operation. High voltage adjustment is also described.
Two test points are provided for the measurement of the high voltage supply. TP3 is a direct or 1:1 test
point, requiring a high impedance high voltage probe. This type of probe has a nominal 1000 meg
impedance, and will not load down the supply under test. The ground reference used should be TP4. A
second test point, TP5, provides a buffered output whose voltage is 105:1 of the actual high voltage. This
point may be measured with a 10 meg input impedance voltmeter directly. To set a nominal 525 volt high
voltage output, the value at TP5 should be 5.0 Volts. The high voltage value is adjusted by potentiometer
R118.
If error code E0012 is displayed on the UDR, the auto-zero correction is out of adjustment range.
Specialized test equipment and firmware are required to adjust the auto-zero. If the test equipment and
firmware is not available, the unit should be returned to Fluke Biomedical RMS for re-alignment.
Required equipment:
a.
Test Firmware labeled TEST 977 V10
b. Digital voltmeter with mini clip leads
c. Pot tweeker or small slotted screwdriver
d. Laptop computer running a terminal emulation program such as “GT” or a programmable terminal
set up as follows:
Baud Rate: 4800
Data Bits: 8
Stop Bits: 1
Parity: None (N)
Keyboard: CAPS locked
e.
The 946 series readout module and interconnection cable from the 946 to 977 detector; used to
supply ±15 VDC power to the detector.
f.
A test cable that will connect the 977 J4 RS-232 connector to the laptop or terminal RS-232 port.
Cable pinout is J4-1 (XMIT) to terminal receive, J4-3 (ground) to terminal ground pin and J4-4
(RCV) to terminal transmit.
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