BRUEL & KJAER 5998 Service Manual page 31

Chapter 3 — Checking Procedure
Checking Procedure
9. Apply 28 VDC to the Ext. Polarization Voltage Input on the rear panel.
10. Taking into account that the output impedance of the polarization voltage sup-
*For example, if your DVM has an input impedance of 10 MΩ, the display would read 21.5V when the polarization
voltage is 28 V and the output impedance is 3.0 MΩ (using simple potential divider theory).
3 − 14
ply is 3.0 MΩ when fed externally, measure the voltages on;
pin 3 of the Channel A Receiver BNC socket and
pin 3 of the Channel B Transmitter BNC socket.
They should give an equivalent voltage
Reciprocity Calibration Apparatus Type 5998
*
of 28 V.
Service Manual
Brüel & Kjær