HP 400D Operating And Service Manual page 6

Section HI T.O. 33A1-12-349-1
REFERENCE
NUMBER DESIGNATION FUNCTION
Panel meter Indicates rms volts and decibels of sine wave signals.
Indicator light Indicates that voltmeter is turned on.
ON Power switch Applies line power to voltmeter.
INPUT terminals Receive voltage to be measured or signal to be
amplified.
RANGE (DB-VOLTS) switch | Selects full-scale deflection sensitivity.
OUTPUT terminais Supply signal level proportional to meter reading,with
same waveform as applied to INPUT terminals.
Zero adjust screw Meter zero adjust screw (for 400D and 400H only).
Figure 3-1. Voltmeter Front Panel, Showing Controls and Connectors
3-0 00102-2