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Table 8-7
A8 & A9 YTF & GaAs FET Amplifier Drive
Latc
Bit
Bit Weight
h
2
11 to
4095 to 0
0
3
11 to
4095 to 0
0
6
11 to
4095 to 0
0
6
11 to
4095 to 0
0
To Select a Multiplexer (Voltmeter Monitor Point)
Bit Mnemonic
Main Tuning DAC
Fine Tuning LDAC
Tune Span DAC
Output Level DAC
HP 70427A/HP 70428A User's Guide 8-13
Advanced Hardware Control
Bit Description
*Power-on/Reset State
YTF main tuning DAC ~ 7.32
MHz/step
4095= 400 mA YTF current (max
freq)
* 100
0= 0 mA YTF current (min freq)
YTF fine tuning DAC ~ 85.2 KHz/step
4095= minimum added YTF current
*2048
0= maximum added YTF current
Rear panel tune span DAC
4095= 9.95 V
*0= 4.33 V
4095= maximum gain
*0= minimum gain
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