Table of Contents
Advertisement
MAINTENANCE
MODELS 6108,
610BR ELECTROMETERS
the
1O-5 to lo-l1
ampere
ranges,
set
the
FEEDBACK Switch
to FAST.
The Model
6108 should
indicate
the
input
current
to ?2% of
full
scale
from
the
.L to 10-B
ampere
ranges,
%% of
full
scale
from
the
10-g
to
IO-l1
ampere ranges.
d.
u.
All
resistance
ranges
will
be within
specifications
if
the
current
ranges
are within
specifications
and if
the ohms range
calibration
(paragraph
4-10)
is
correct.
No other
procedures
are necessary.
e.
coulombs.
Set the
FEEDBACK Switch
to FAST and the tiltiplier
Switch
to 3.
Use the
current
source
to provide
an input
current.
With
the
Range
Switch
set
to the COULOMBS ranges
given
in Table
5, apply
the
corresponding
input
current.
Use a stop
watch
to time
the rise
to full-scale
deflection.
Minilmml
COULOMBS Range
Input
Current
Rise
Time
(Range
Switch)
To Model
610B
(Zero
to Full
Scale)
10-7
10-B ampere
30 seconds
10-B
10-g
10-g
ampere
30 seconds
10-10
10-10
ampere
30 seconds
10-11
ampere
30 seconds
4
TABLE 5.
Coulomb
Ranges Accuracy
Check,
The table
gives
the
input
current
needed
to check
the
rise
time
for
each coulomb
range.
4-13.
DRIFT CHECK.
Refer
to the accuracy
check
before
performing
the
drift
check.
a.
Set the
front
panel
controls
to
METER Switch
+
tiltiplier
Switch
.03
Range Switch
VOLTS
ZERO CHECK Button
LOCK
FEEDBACK Switch
NORMAL
Set the
Output
Switch
on the back
panel
to 3 V.
b.
Connect
the Model
610B OUTPDT Receptacle
to the Model
370 Recorder.
Set the
recorder
to 1 volt.
Make sure
the Model
610B chassis
cover
is
attached
with
at
least
two screws.
c.
Make the
drift
run
for
at
least
24 hours.
The zero
drift
specification
is
200 microvolts
per hour
maximum averaged
over
any 24-hour
period
after
warm-up;
during
two-hour
warm-up,
no more than
2 millivolts
after
the
first
hour(Refer
to
Chart
1).
d.
Change electrometer
tubes
if
the
instrument
does not
meet the
zero
drift
specification.
36
1066R
Advertisement
Table of Contents
