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E.
INTERNAL RESISTOR CREW
(1) To check 109:
to OHMS x 109.
Turn input
switch
to ZERO CRECK, function
switch
Turn VOLTS FULL SCALE to 1.0 or 3.0.
Turn input
switch
to RES CEECK.
1.00 x 109.
If reading
is exactly
one volt,
resistor
is
If reading
is low,
subtract
the percent
correction
when measuring
AMPERES and add the percent
correction
when measur-
ing ORMS.
(2) To check 101':
Turn VOLTS FULL SCALK to .l or .3.
Reading
should be .1 volt.
(3) To check 1011:
Turn VOLTS FULL SCALE to .Ol or .03.
Reading
should be .Ol volts.
F.
INTERNAL VOLTAGR CHECK
The Internal
225-volt
and lOO-volt
supplies
are used to test
re-
sistance
samples and therefore
should be checked periodically
and.
always befors
the high megohm standards
are checked.
To check,
turn
meter switch
to CRECK 225~.
The meter should point
to
2.25
on the 3.0 scale.
Then turn
meter to 100~.
The meter should read exactly
full
scale.
If either
potential
is not correct,
set with
the appropriate
con-
trol
at the back of the instrument.
G.
USING EXTERNAL INDICATORS
The output
of the Model 610 will
drive
one milliampere
recorders
and
servo rebalance
recorders,
as well
as higher
impedance instruments
such
as pen recorder
amplifiers
and oscilloscopes.
(1) For use with
one milliampere
instruments
such as Esterline
Angus, General Electric,
and Texas Instrument
Rectiriter:
Connect
to output
connector
at rear
of instrument,
pin 1 is the positive
terminal.
Place output
switch
at 1 MA position.
Output is approx-
imately
1 ma for full
scale meter deflection
on any range and can
be made exactly
1.00 ma.
Turn to a voltage
rangs such as 100 milli-
volts
full
scale,
where zero control
has enough latitude,
and adjust
ZERO until
panel meter reads full
scale.
Then adjust
mCORDRR CAL
at the rear until
the recorder
also reads full
scale.
Next check
the zero of the recorder
and the panel meter and repeat
full
scale
calibration.
The meter polarity
switch
does not reverse
the re-
corder
output.
(2) For use with
servo rebalance
recorders:
On the 1 MA position,
there
is enough latitude
in the RECORDER CAL pot so that
even if
the recorder
terminals
are short
circuited,
exactly
one milliampere
can be made to flow at full
scale
deflection
of the panel meter.
Therefore
for
servo rebalance
recorders,
place a resistor
across
the output
terminals
equal to 1 ohm per millivolt
of span and ad-
just
RRCORDEX CAL to make sensitivity
equal to full
scale meter
deflection.
For example,
with
a 50 millivolt
recorder
place
50
ohms across
output
terminals
before
connecting
recorder.
Iv-4
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