HP 5335A - Keyboard and Control Functions

Operation and Programming
playing 11 and 12 digit numbers, the grouping is omitted. The number of digits displayed is
determined by the function and gate time. In most cases, a longer gate time gives more digits.
3-20. When resolution calls for more than 12 digits no overflow results. Instead, the MSD’s are
retained, and the display is reduced to 12 digits.
3-21. The exponent range of the display is ±18. If a number cannot be displayed the display will
show one of these two numbers.
0, +19 .(OX lO 1 ^ ) if the number is too large.
0, -19 .(OX 10-19) if the number is too small.
If you suddenly see two less digits in frequency, period, or time
interval measurements, there may be a failure in the inter¬
polators. If you press RESET you may get these digits back, or
you may get a FAIL message. See the section on diagnostics in
Section VIII.
3-22. Annunciators indicate the Hertz, Seconds, and Volts units. For some functions the units
are not indicated, but assumed, such as degrees for phase measurements. For slew rate, both the
Volts and Seconds annunciators are on to indicate Volt/second.
3-23. The GATE light shows the status of the counter’s gate. Before the measurement starts,
this light is off, indicating that the gate is closed. During the measurement, the light is on,
indicating that the gate is open.
3-24. The TALK, LISTEN, SRQ, and REMOTE lights monitor the status of the HP-IB. Refer to
Programming, paragraph 3-151.
3-25. Keyboard
3-26. The keyboard is divided into several groups, according to the purpose of the keys. From
the left, we have MATH/STATISTICS, FUNCTION, GATE/CYCLE, INPUT, and if installed, INPUT
C (Option 030), and VOLTS (Option 020). With exceptions, each group operates fairly inde¬
pendently of the others. The operation of each front panel key, within each keyboard group,
is presented in Front Panel Features, beginning with paragraph 3-37.
3-27, Key Indicators
3-28. The operation of individual keys is relatively straightforward. Indicator LED’s, in the center
of many keys, represent that key’s status. A steady “on” LED indicates that the key’s labeled
function is active or in-effect. An “off” LED indicates that the key’s labeled function is not active
or disabled. Many keys operate in a toggle on/off fashion. The blue colored keys in the MATH
function group can be programmed. A “blinking” LED within a blue key is used as a “prompt”
for the operator. It indicates that it is waiting for a data entry. Number entries are made from the
keys labeled in blue. Refer to paragraph 3-72.
3-29. Keyboard Memory
3-30. To avoid having to re-enter math constants, etc., whenever switching between two
functions repetitively, the keyboard has one level of memory. This allows you to set up two
functions modes, each with their own set-ups. The key set-ups for each of the keys in the
MATH, STATISTICS, FUNCTION, GATE, and CYCLE groups are automatically memorized.
Controls within the INPUT group are not memorized.
3-3
Model 5335A