Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 71
Pin # GPIB Signal Description
5 EOI End- Or- Identity
6 DAV Data Valid
7 NRFD Not Ready for Data
8 NDAC Not Data Accepted
9 IFC Interface Clear
10 SRQ Service Request
11 ATN Attention
12 SHIELD Tied to Digital Ground
13 DIO5 Data Input/ Output bit
14 DIO6 Data Input/ Output bit
15 DIO7 Data Input/ Output bit
16 DIO8 Data Input/ Output bit
17 REN Remote Enable
18 GND Digital Ground
19 GND Digital Ground
20 GND Digital Ground
21 GND Digital Ground
22 GND Digital Ground
23 GND Digital Ground
24 GND Digital Ground
Table 3-31: GPIB Interface Connector Pinout
3.9 Clock and Lock Connectors (Optional)
The connectors for the Clock signal, CLOCK, and Lock signal, LOCK, are BNC-type located on the rear
panel; refer to Figure 3-24 for view of connectors and Table 3-32 for descriptions. These connectors are
only available with the LKM or LKS options. These options are used to synchronize and control the phase
shift of the output voltage of Auxiliary power sources in relation to the output of the Leader power source.
The frequency of the Auxiliary power sources is determined by the frequency of the Leader source through
the CLOCK signal; the phase is determined by the LOCK signal.
Figure 3-24. External Clock/Lock Interface Connectors (Option)
Function Characteristics
LKM (Option)
Signal outputs in Leader unit for Clock and Lock that are used to synchronize two or more
sources; CLOCK sets the frequency, while LOCK sets the phase; logic level,
TTL-compatible; individual rear panel BNC connectors for each signal; safety isolation
SELV-rated, referenced to chassis.
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