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Page 34
Setting the Current Monitor
A combination of two internal DIP switches, S1 and S3, are used to set the current monitor scale
for the channel. Although DIP Switch S1 and S3 have eight individual ON / OFF switches labeled 1
through 8, only switches S1-7, S1-8, and S3-7 are utilized.
Logarithmic scale applies to both channels. S1-7 and S1-8
have no effect when S3-7 is ON (i.e. logarithmic scale).
NOTE
Since 1976
To change the respective monitor scale:
1. Turn unit OFF via the
POWER
switch
2. Remove power cord and ion pump cable(s)
3. Remove the six #6-32 screws along the edge of the top cover
4. Carefully lift the top cover and disconnect the fan plug
5. Remove top cover
6. Locate DIP Switch S1 and DIP Switch S3 (see
7. Set switches to desired scale for each channel:
CHANNEL 1 linear [μA]:
S1-7,
OFF
/ S3-7,
OFF
CHANNEL 1 linear [mA]:
S1-7,
ON
/ S3-7,
OFF
(default)
CHANNEL 2 linear [μA]:
S1-8,
OFF
/ S3-7,
OFF
CHANNEL 2 linear [mA]:
S1-8,
ON
/ S3-7,
OFF
(default)
Logarithmic:
S3-7,
ON
8. Connect the fan plug and replace top cover
When ready for use, user should re-connect the ion pump cable(s) and power cord. Thereafter,
Terranova® 752A operation may be resumed.
User should wait at least 15 seconds after turning OFF the
Terranova® 752A before removing the power cord
WARNING!
