VCA/SUM IN
This is the input socket for external voltage controlled amplitude (VCA) or external signal
summing (SUM). The function of this input is selected from the EXT SUM/VCA SET-UP screen.
For VCA operation the input impedance is nominally 6k
Ω
and for SUM operation it is nominally
1k2
Ω
.
Do not apply external voltages exceeding ±10V.
Rear Panel Connections
REF CLOCK IN/OUT
The function of the CLOCK IN/OUT socket is set from the “ref clock i/o” menu on the UTILITY
screen, see System Operations section.
INPUT
This is the default setting. The socket becomes an input for an external
10MHz reference clock. The system automatically switches over from the
internal clock when the external reference is applied.
OUTPUT
The internal 10MHz clock is made available at the socket.
PHASE LOCK
When two or more generators are synchronised the slaves are set to PHASE
LOCK SLAVE and the master is set to PHASE LOCK MASTER.
As an output the logic levels are nominally 1V and 4V from typically 50
Ω
. CLOCK OUT will
withstand a short-circuit. As an input the threshold is TTL/CMOS compatible.
Do not apply external voltages to this output exc7
·
5 V or -2
·
5 V.
HOLD IN
Controls the waveform hold function. The input impedance is nominally 10k
Ω
.
Do not apply external voltages exceeding ±10V.
CURSOR/MARKER OUT
Output pulse for use as a marker in sweep mode or as a cursor in arbitrary waveform editing
mode. Can be used to modulate the Z-axis of an oscilloscope or be displayed on a second ‘scope
channel. The output impedance is nominally 600
Ω
and the signal level is adjustable from 2V-14V
nominal from the “cursor/marker” menu
on the UTILITY screen, see System Operations section.
Do not apply external voltages to this input.
RS232
9-pin D-connector compatible with the Thurlby Thandar ARC (Addressable RS232 Chain)
system. The pin connections are shown below:
Pin
Name
Description
1
-
No internal Connection
2
TXD
Transmitted data from instrument
3
RXD
Received data to instrument
4
-
No internal connection
5 GND Signal
ground
6
-
No internal connection
7
RXD2
Secondary received data
8
TXD2
Secondary transmitted data
9 GND Signal
ground
15