Omega Engineering 873C Operator's Manual page 16

DC Voltage Checks
1. Battery: V B A T > 7 . 5 V
2. -HV to (Analog Ground) = -1-2.9 ±0.3V
3. -fV to (Digital Ground) = +5V ±1V
4. Reference Diode
CR101 (Anode) to (Analog Ground) = -1.23V ±0.03V.
5. Negative reference divider (R114) referenced to analog ground. *
Pin 12
Pin 10
Pin 11
Pin 7
Pin 9
Pin 8
Pin 6
Pin 4
Pin 5
Pin 3
Pin 2
873C
= -1.23 V
= -0.209V
= -0.209V
= -0.206V
= -0.204V
= -0.204V
= -0.201V
= -0.200V
= -0.197V
= -0.195V
= -0.193V
Pin 12
Pin 11
Pin 10
Pin 9
Pin 8
Pin 7
Pin 6
Pin 5
Pin 4
Pin 3
Pin 2
873F
= -1.23 V
= -0.209V
= -0.208V
= -0.205V
= -0.204V
= -0.203V
= -0.198V
= -0.197V
= -0.196V
= -0.191V
= -0.188V
*The setting of Rl 15 and the tolerances of the resistors within the net-
work (R114) can affect these levels by ±5%.
6. Cold Junction Voltage
(Ambient Temperature = 25°C ±3°C)
Across R102A approximately equal to ImV.
7. Waveform Checks (see Figure 6)
U104 pin 40 (OSC 1)
U104 pin 39 (OSC 2)
U104 pin 38 (OSC 3)
U104 pin 21 (Backplane)
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