HP 35601A Operating And Service Manual page 93

Service
Model 35601A
K O ... Toggle Overload
Pressing this key resets the Overload Flip-Flop on the A5 board which turns off the
OVERLOAD indicator on the front panel of the -hp- 35601 A. If an overload condition still
exists, however, the overload Flip-Flop will immediately set again. In this case, the front
panel indicator will remain on. Pressing K O will not turn the indicator on (i.e. set the
Overload Flip-Flop) if it is off.
K1 ... Toggle Out-Of Lock
Pressing this key resets the Out-of-Lock Flip-Flop on the A5 board which turns off the
OUT-OF-LOCK indicator on the front panel of the -hp- 35601 A. If an out-of-lock condi­
tion still exists, the Out-of-Lock Flip-Flop will immediately set again. In this case, the front
panel indicator will remain on. Pressing Kl will not turn the indicator on if it is off.
K2 ... Change DAC
When this key is pressed the display prompts the operator to enter a number from -10 to 10.
When this number is entered and CONTINUE is pressed, the computer sends the ap­
propriate data to the -hp-35601A. (The number must be a multiple of 0.04 or the software
will round the absolute value of the number to the lower multiple of 0.04.) In addition, the
computer display is updated to show the present output voltage of the DAC.
K3 ... Change Gainl
This key affects the gain of the 0-28dB Amplifier. When the calculator prompts the user to
enter a number, a multiple of 4 from 0 to 28 should be entered, followed by pressing CON­
TINUE. The -hp- 9845B will change the gain to the value entered and update its display to
reflect the change.
K4 ... Change Gain2
This key affects the gain of the 6-20dB Amplifier. When the calculator prompts the user to
enter a number, a multiple of 2 from 6 to 20 should be entered, followed by pressing CON­
TINUE. The computer will change the gain to the value entered and update its display to
reflect the change.
K5 ... Change Lead Lag
This key changes the lead/lag characteristics of the phase-locked loop on the A5 board.
When the calculator prompts the user, a number from 0 to 7 should be entered followed by
pressing CONTINUE. The computer will change the lead/lag number to the entered value
and update its display to reflect the change.
K6 ... Change Attenuationl
Pressing this key enables the user to change the attenuation of the 0-20dB Attenuator. The
computer prompts the user to enter a number (1, .5, .2, or . 1) that represents the ratio of the
output voltage to the input voltage of the attenuator. When CONTINUE is pressed, the
state of the attenuator is changed and the calculator display is updated.
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