64-Bit Digital I/O Module with Memory and Counter 10
34980A User’s Guide 287
Clock
The general- purpose clock output is derived from the internal time base.
The output clock is divided down from the time base clock such that:
Clock Output (Hz) = (time base frequency)/(divisor)
The time base frequency is 40 MHz. The divisor can be an integer from
2 to 4
6
providing a range of 20 MHz to 10 Hz for the clock output.
The valid values for the clock output rate are: 20 MHz, 13.33 MHz,
10 MHz, 8 MHz, 6.667 MHz, ... 10Hz. The clock output frequency will round
to the nearest achievable frequency.
The commands used to control the clock output are:
SOUR:MOD:CLOC:FREQ {<freq>|MIN|MAX|DEF},<slot>
SOUR:MOD:CLOC {OFF|ON|0|1},<slot>
You can obtain the rounded value of the currently set clock frequency
using the following query.
SOUR:MOD:CLOC:FREQ?
You can also set the logic “1” voltage level for external clock output.
For example, the following command sets the output clock level to 4.5 V
for the module in slot 5.
SOUR:MOD:CLOC:LEV 4.5, 5
34950A D-Sub Connectors
The 34950A uses two D- sub 78- pin female connectors. Each connector
provides contains one bank of the module. As viewed from the rear panel,
the connectors and their banks are shown below.
P1 (Bank 1)
P2 (Bank 2)
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