Dcv Test; Ohms Test; Section Iv. Performance Test - HP 3456A Operating And Service Manual

4-1. IlrRDDUCTlDI.
4-2. This section has the Performance Test procedures
to verify the 3456A's Accuracy Specifications, as listed
in Table 1·1. The tests are done without removing any
instrument covers. An HP-ID test is not performed since
the HP-IB Verification Tape is for that purpose. In ad­
dition, no Math Operation checks are made since math
accuracy depends on instrument function accuracy.
4-3. In many instances, a Performance Test is done
after adjusting the 34S6A. Since both the Performance
Test and Adjustment procedures use the same test
equipment, a combined procedure is in this Manual's
Section V, Paragraph 5-21.
4·4. EDUIPMElr REDUIRED.
4-.5. All of the required test equipment for the tests is
listed in Tables 1-2 and 4-1. The required equipment for
each individual test is listed at the beginning of each
test. If any recommended test equipment is not avail·
able, substitute equipment may be used. A short de·
scription of the required equipment and the critical re·
Quirements necessary to do the various tests is given in
the following paragraphs. This information may be
helpful in choosing substitute equipment.
4-,. DCV rllt
4·7. For the DCV Test a dc transfer standard is
required which is calibrated to a 1.017 V to 1.019 V
standard cell. The standard cell's accuracy should be
calibrated by and traceable to the National Bureau of
Standards (NBS). If the 34S6A is to be calibrated to its
24
hour accuracy specifications, the transfer standard
must be adjusted for an optimum 1 V and 10 V output
using an NBS calibrated standard cell. The standard
should be adjusted shortly before testing the 3456A's de
accuracy. It is also recommended to leave the transfer
standard in a controlled environment where the ambient
temperature is within one or two degrees of the tempera·
ture in which it was calibrated. The 3456A should also
be tested in this environment. If the recommended
transfer standard is not available, use an NBS calibrated
standard cell (1.017 V to 1.019 V) or another transfer
standard. If another standard is used, use the recom­
mended reference divider, shown in Figure 4-2, for all
DCV accuracy tests (including 1 V and ID V). A
simplified schematic of the reference divider and
associated set-up is in Figure 4-3. The following lists
some of the test equipment and their critical re·
quirements.
SECTION IV
PERFORMANCE TEST
a. DC Transfer Standard. The DC Transfer Standard
chosen for the DCV Test is the Fluke Model 731B DC
Reference Standard. The critical requirements are:
I.
Required output voltage is 1.018 V or 1.019 V. A
transfer standard with 1.017 V capability can also
be used.
2. Additional required output voItages are 1 V and
10 V.
3. Accuracy
( ± .OOOI�.).
4. Stability is better than ± 10 ppm ( ± .001
days.
b. DC Voltage Standard. The DC Voltage Standard
chosen for the DCV Test is the Systron Donner Model
MI07 Precision Voltage Source. The critical require·
ments are:
I. Output from 10 mV to 1000 V dc.
2. Within ±
3. Short term stability better than .000 2 '10 per hour.
c. Reference Divider. The recommended reference
divider is the Fluke Model 750A Reference Divider. The
crit ical specifications are:
1. Output voltage range is from .1 V to 1000 V.
2. Division accuracy is better than ± .001
4-8. Oh
4-9. For the Ohms Test use the recommended standard
resistors.
substitutes that meet the critical requirements, as given
below. If a substitute is not available you may be able to
use a calibrated decade resistor with settings that range
100
from
the decade
algebraically added to the 34S6A's reading to achieve
the required accuracy. The 1000 M ohm resistor, -hp­
Part Number 034S6-67902, is also required when using
the decade resistors. The standard resistors and their
critical requirements are:
a. 100 ohm and
recommended
requirement is
.00S'1o
full scale accuracy.
rllt
...
If the resistors are
ohm to 10 M ohm. The correction factors on
resistor's calibration
1 K
ohm standard resistors. The
resistors are the
ppm
at least ± 5
'1.)
for 30
'1
• .
not available, use
chart must be
Guildline Model
4-1