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PERFORkfANCE
VERfFCA?-ION
4.5 VERIFICATION
PROCEDURES
The following paragraphs
contain procedures
for verify-
ing the one year accuracy specifications
of~the in$wnent,
at 5%d resolution, for each of the five measuring !%ncti&w:
DC~volts, TRMS AC volts, ohms, TRMS AC amps, and DC
amps. These procedures are intended for use only by quali-
fied personnel using accurate and reliable test equipment.
If the instrument
is out of specifications
and not under
warranty, refer to Section 6 for calibration
procedures.
WARNING
The maximum common-mode
voltage (voltage
between input low and chassis ground) is 500V
peak. Exceeding this value may cause a break-
down in insulation,
creating
a shock hazard.
Some of the orocedures in this section mav ex-
pose the user to dangerous voltages. Use &an-
dard safety precautions
when such dangerous
voltages are encountered.
4.5.1 DC Volts Verification
With the Model 199 set to 5*&d resolution,
verify the DC
volts function as follows:
CAUTION
Do not exceed 300V between the input HI and
LO terminals or damage to the instrument
may
occur.
1. Select the DCV function and autorange.
~~
2. Connect the DC voltage calibrator to
the
Model 199 as
shown in Figure 4-l.
3. Set the calibrator to OV and enable zero on the Model
199. Verifj that the display is reading CGO.OOOmV +2
counts.
NOTE
Low measurement
techniques
should
be used
when checkine the 3oomV DC rawe. Refer to Sara-
graph 2.6.5 forlow
level me&ure&ent
consihera-
tions.
4. Set the calibrator to output c3OOmV and verify that the
reading is within the limits listed in Table 4-2.
5. Disable zero and leave it disabled for the remainder
of
the DCV verification
procedure.
6. Check the 3V, 3OV, and 3OOV ranges by applying
the
respective
DC voltage levels listed in Table 4-2. Verify
to see that the reading for each range is within the limits
listed in the table.
7. Repeat
the procedure
for each of
the
ranges
with
negative voltages.
datable 4-2.
Li@s
for DC Volts Ver,ification
Allowable
Readings
(IPto
28'0
299.961 to 300.039
2.99977
to 3.00023
29.9970
to 30.0030
299.970
to 300.030
NOTE: Repeat procedure
for negative voltages.
MODEL
199
Figure 4-1. Connections for DC Volts Verification
4.5.2 TRMS AC Volts Verification
With the instrument
set to 5%d resolution,
perform the
following procedure
to verify the AC volts function:
CAUTION
Do not exceed 300V RMS, 42%' peak lOY*Hz
between the input HI and LO terminals or instru-
ment damage may occur.
1. Select the ACV function and autorange. Do not use zero
to cancel the offset in this procedure.
Turn zero off, if
it iS enabled.
2. Connect the AC calibrator to the Model 199 as shown
in Figure 4-2.
3. Set the calibrator to output 2-V
at a frequency of 2OHz
and verify that the
reading
is withii
the limits listed in
Table 4-3.
4. Repeat the 29omV measurement
at the other frequen-
&S
specified
in Table 4-3.
5. Repeat the procedure
for the 3V, 30V and 3COV ranges
by applying the respective
AC voltages listed in Table
4-3. Check to see that the reading
for each range is
within the limits listed in the table.
4-2
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