Ametek 7270 Instruction Manual page 122

Chapter 5, FRONT PANEL OPERATION
5-74
Figure 5-58, DAC Menu - Dual Reference and Dual Harmonic Modes
The DAC menu is used to configure the signal that will appear on the four DAC
connectors on the rear panel of the instrument. On the left hand side of the panel four
controls are used to set the DC voltages of the auxiliary DAC outputs, while on the
right hand side four controls are used to select the signal that will actually be applied
to the DAC 1 to DAC 4 connectors. The controls operate as follows:
AUX DAC 1, AUX DAC 2, AUX DAC 3, and AUX DAC 4
These four controls set the voltages of the corresponding auxiliary DAC to any value
between -10.000 V and +10.000 V in 1 mV increments. Adjustment is faster using
the Keypad or Active Cursor controls - see section 4.1.04. Note that these voltages
will only appear at the connectors if the corresponding DAC SETUP on the right
hand side of the screen is set to USER DAC.
DAC1 SETUP, DAC2 SETUP, DAC3 SETUP, and DAC4 SETUP
These four controls select which signal will be made available at the corresponding
DAC 1 to DAC 4 connectors on the rear panel of the instrument. The following
settings are available, but note that internal connection limitations mean that not all
settings are available for each DAC connector.
X1% (2.5V fs)
When set to X1% the corresponding DAC connector on the rear panel of the
instrument outputs a voltage related to the X1%fs front panel display as follows:-
X1% DAC Voltage
+300
+100
0
-100
-300
Y1% (2.5V fs)
When set to Y1% the corresponding DAC connector on the rear panel of the
instrument outputs a voltage related to the Y1%fs front panel display as follows:-
7.5 V
2.5 V
0.0 V
-2.5 V
-7.5 V