Remote Programming Examples; Operators Checks; 3292: Bench Use Ii :Cc:i Deeuheitiea; Hp-Ib Operation - HP 3455A Operating And Service Manual

Section III
ment, and are only provided as additional information
for HP-IB system use. The following is an explanation
of the various times involved in a measurement se-
quence.
a. tl (Typical Input Data Transfer Time): This is the
typical time it takes to transfer input data (set the 3455A
to a certain function and range, etc) from a controller to
the instrument. The transfer time depends on the num-
ber of ASCII character send to the instrument and the
response time of the controller. For example, to send an
"F1T3" message to the instrument takes four charac-
ters.
b. 42 (Typical Input Settling Time): The instrument
is triggered (HP-IB, External, or Hold/Manuail Trigger)
and the 3455A begins to take a reading. This time con-
sists of the settling time of the input relays, FETs, and
other circuits.
c. 13 (Typical Measurement Time): The input mea-
surement is taken at this time. This includes the A-to-D
conversion time.
d. 14 (Typical Computation Time): When the
measuring and the A/D operations are completed, the
instrument's internal main controller circuits calculates
the correct measurement reading. This time is the
amount of the time it takes to complete the calculation.
d. tS (Typcial Output Data Transfer Time): The
3455A now sends the reading to the HP-IB output buf-
fers to be transferred to the controller. This time also
depends on the response time of the particular con-
troller.
3-88. Remote Programming Examples.
3-89, Appendix A at the end of this manual has Remote
Programming examples for the 3455A. These examples
are given in the HP Basic (-hp- Model 9830A/B Con-
Model 3455A
troller), HPL (-hp- Model 9825A Controller) and
Enhanced Basic (-hp- Model 9835A/B and 9845A/B
Controller) languages. The examples in the Appendix
can be helpful when you write programs for the 3455A.
3-90. OPERATORS CHECKS.
3-91. The TEST feature provides a convenient method
of testing the basic operational capabilities of the Model
3455A. This test plus an operational check of the Ohms
and AC functions tests the major portion of the 3455A
circuitry. Keep in mind the following checks test only
the operating capability of the 3455A. They do not
check the performance accuracy.
3-92. BENCH USE.
3-93. The following sequence may be used to manually
check operational capability of the 3455A.
a. Set the 3455A to AUTO RANGE.
b. Press the TEST button. The display should be
blank while the 3455A is performing the self test. Upon
successful completion of the test, all front panel in-
dicators (except the REAR TERMINAL indicator) will
light and a reading of + 8888888 with all decimals lit
will be displayed. The self test will be repeated until
another function is selected.
c. Connect a short across the INPUT terminals.
d. Press the 2 WIRE kf. button. The froat panel
display should read .00000 + 300 milliohms.
e. Press the ACV button. The display should read
.00000 + 600 microvolts.
3-94.HP-IB Operation.
3-95.Figure 3-5 shows the steps necessary to perform
the 3455A operators check from the Bus.
Table 3-6. Typical HP-IB Controlled Measurement Times.
Input Oara Transfer Time
Output Data Transfer
Input Setting Time Computation Time
Line
Function Fiéquency
High Resolution OFF
Auto-Cal OFF
High Resolution ON
Auto-Cal ON
High Resolutian ON
Auto-Cal OFF
High Resolution ON
Auto-Cal ON
High Resolution OFF
OC Volts
$50 psec per character
plus the response time of
Controller
Ohms
[22 msec |
=
12.5 ms for.1 V 10 10 V
Ranges
15.5 msec lor 100 and
1000 V Ranges
750 msec per character
plus the respanse time of
the controlter {the 34554,
output usage consists of
15 charactersi.
Auto-Cat OFF
i EPROP Pa
Auto-Cal
ON or OFF
Fast AC Vols
48 msec
$5 msec
High Resolution OFF [tz msec | ad msec
Auto-Cal ON CX Ta
High Resakaion ON
AutoCal OFF [22 msec] 330 mse
Tigh Fesonaton ON [aes [280 meee |
Auto-Cal ON [72 msec | 930 msec |
Normar AG vars | Auto-Cat [35 mse | 700 see |
ON or OFF # [27 msec [830 mse] 12 msec all Ranges
64 msec.
34554 Triggered
at this time
3-14 RevA
Note: Time t3 should be used far each range being measured when the 34554 is in the
Auto-tange mode Isee Paragraph 3-38.)