Front Panel Features; On/Stby; Operation And Programming (Continued); A Channel - HP 5384A Operating And Service Manual

•
•
•
be displayed until the RESET /LOCAL key is pressed or
a DCL (device clear) command is sent to the counter
by the controller. Illegal commands can either be
commands not recognizable to the counter or com-
mands which are recognizable, but are invalid if the
counter is in the diagnostic or talk only modes.
3-33. Instrument error messages are listed in
Ta-
ble
3-2.
Table 3-2. Error Messages
Error
Messages
10
Self-test error
50
Unrecognizable mnemonic in command
51 Illegal numeric in command
52 First character of command is illegal
53
Illegal character in the "DR" (remote display)
command
55
Invalid HP 5384A/85A command or HP-IL
protocol or frame error
56 Invalid diagnostic command
60 ROM failure in
1/0
processor
61 RAM failure in
1/0
processor
70 Controller connected to talk-only instrument
3-34. If the fuse in the Channel B input opens, the
message "INPUT ERROR" will appear on the display.
3-35. FRONT PANEL FEATURES
3-36. The front panel controls, indicators, and con-
nectors are shown in Figures 3-7 through 3-9.
3-37. The following paragraphs describe the general
purpose and use of the operator keys and controls.
They are discussed by functional grouping, as follows:
a. ON/STBY
b. A CHANNEL
c.
B CHANNEL and A&B
d. GATE and DISPLAY DIGITS
e. RESET /LOCAL and CHECK
f. INPUTS
3-38. ON/STBY
3-39. The ON/STBY switch connects or disconnects
the output from the +5-volt supply to the rest of the
instrument. It does not control the ac power line at
the primary of the power transformer. If Option 004,
the ovenized oscillator is installed, +S volts is supplied
HP 5384A and HP 5385A
Operation and Programming
to the oscillator whether the power switch is in the
STBY (standby) mode or in the ON mode (with the ac
power cord or external de connected). Figure 3-1
shows the ON/STBY switch.
POWER 1
.L STBY
g
_._
O~J
Figure 3-1. Front Panel ON/STBY Switch
3-40. A CHANNEL
3-41. Function selection for the HP 5384A and HP
5385A is accomplished through a simple one key per
function keyboard. You may select from fourfunction
modes (labeled in black) accessible from the four keys
grouped under A. The arrows appearing in the
bottom of the display identifies which functions are
active. The four functions in the A channel group are:
FREQ, X20 ATIN, PER, FILTER. Refer to Figure 3-2, Front
Panel A Channel Function Keys.
A
EJEJ
~B
lOOk H.·
Figure 3-2. Front Panel A Channel Function Keys
3-42. FREQ key selects the frequency mode of
operation for the A channel input.The frequency
range of Channel A in both counters is 10 Hz to 100
MHz. When Channel A is selected, a black arrow
appears in the bottom of the LCD over the" A" label
located directly below the display window and the
frequency at input A is measured and displayed.
3-43.
If the counter has just been powered-up,
Channel A is automatically selected (initialize mode)
with a gate time of 0.1 s. If the counter has been
3-3