Controls, Connectors And Indicators - HP 4935A Operating And Service Manual

Model 49XiA
CONTROLS, CONNECTORS AND INDIC.ATORS
1. Power Cord Module. Accepts power cord supplied with instrument. Contains line fuse and PC
board for selecting line voltage (see Section II, paragraph 2-9 for procedure to select line voltage).
POWER button. Switches power to front panel bvhen in ON position. In STBY position power is
still applied to some circuits. If unit has battery option there will still be power available to some
internal circuits even in STBY position.
NOR and REV switches. NOR switch depressed connects the left 310 jack to the transmitter and
the right 310 jack to the receiver. REV switch depressed connects the left 310 jack to the receiver
and the right 310 jack to the transmitter. Both switches out simultaneously or depressed
simultaneously internally loops the transmitter to the receiver.
DIAL Binding Posts. Handset can be connected to binding posts to dial-up a line through the 310
SET UP Switches.
13512, 60012, 90012: Provides terminating impedance to match the lines' characteristic
impedance.
DIAL: Disconnects TRMT-RCV 310 jack from the transmitter and connects the TRMT-RCV 310
to the DIAL binding posts.
jack
HOLD: Connects the hold circuits to the TRMT-RCV 310 jacks to hold dial-up lines.
13512,
impedance.
Connects the RCV-TRMT :310 jack through high impedance when the 49:I5A
the circuit under test instead of terminating the line.
HOLD: Connects the receive-hold-circuits to the RCV-TRMT 310 jack to hold the dial-up lines.
measurements will be made in dB relative to this reference. DR LED in center of front panel will
industry
9.
indicates
decremented by pressing STEP DOWN. Holding the STEP UP or STEP DOWN key depressed
the actions to reneat.
causes
Figure 3-I.
Always connect power cord to a proper y grounded 3-wire power outlet.
Do not connect more than 200VDC signal to terminals.
!
60011, 90012: Provides
frequency. This feature eliminates accidental disconnection by SF signaling units
convention.
one-of-five digit positions. Digit value is incremented
Front and Rear
terminating impedance to match the lines' characteristic
increased or decreased. Lighted cursor
be
Panel Controls/Connectors/Indicators
bridges
pressing STEP UP and
by
(Continued)
Operation