Data Ready; Numeric Entry Format And Other Input Considerations; Operator's Check - HP 3456A Operating And Service Manual

Model 3456A
b. Send program codes to recall the R register.
" RER"
c. Set the 3456A to talk. The readings are now output
over the Hp·IB starting with reading #10 and ending
with # I .
In the example, multiple readings are output the same as
explained in paragraph 3-177. A program example using
HPL (9825A Controller Language) and Enhanced Basic
(9835A/B and 98458 Controller Language) is given in
Appendix A.
3·206. Data Ready.
3-207. The Data Ready feature, when enabled, OUlputs
a Require Service Message for a completed measure­
ment cycle. The SRQ mask has to be set before the
message is output. Set the mask by sending program
codes "SMOO4" (for bit 2 of the Status Byte). When the
Require Service message is sent, the front panel SRQ
LED is on. The LED remains on until a new measure­
ment cycle is started (the 3456A is triggered), when the
present reading is output over the HP-IB, or when the
3456A is polled (Serial Poll). If the 3456A is set up to
take a number of readings per trigger, the require ser·
vice condition will be true, at the end of each reading,
for about 320J!S. The condition will remain true and the
SRQ LED turns on, after all the readings are taken.
3·208. 34!i6A's Numeric Entry Format and other Input
Considerations.
3-209. The 3456A's Numeric Entry Format (used in
program codes) are in this form:
The decimal point is optional and ranges from the right
of the overrange digit to the Exponential Designator's
left.
3-210. When sending data to the 3456A in remote, all
lower case (except "e") alpha characters, spaces, car­
rage return, and line feed are ignored. All other invalid
ASCII characters are illegal. The optional "W"
character can be used as a prefix to a numeric string like
this"
FIWIOSTN
3·211. OPERATOR'S CHECK.
3-212. The following is an Operator's Check you can
perform to check the major DCV, ACV, Ohms, and
Digital circuitry. The checks are not used to verify per­
formance accuracy. They are only used to check the
operating capabilities of the 3456A. The following can
be used as the Operator's Check .
a. Remove everything from the 3456A's input ter­
minals.
b. press the TEST button. The display should go
blank while doing an internal test. When the test passes
and is completed, + 1.8.8.8.8.8.8. + 8. is displayed in·
cluding all of the front panel LEDs. The cycle will then
be repeated. If a negative integer is displayed, refer the
3456A to a service trained person. Press the TEST but·
ton a second time.
Operation
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Rev B 3-29/3-30