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17
Special
Function
71
Special function
71
exercises
all
the
LEDs,
except
STANDBY,
GATE, TRIG
A,
TRIG
B,
REM,
ADDR
and
SRQ,
at
approximately
0.5
Hz.
If
the
GPIB
interface
(Option
55)
is
fitted,
the
REM,
ADDR
and
SRQ
indicators
light.
18
Special
Functions
72, 73,
74
and
75
Special functions
72, 73,
74
and
75
should only be used
for
diagnostic purposes
at
an
ambient temperature
of
23,C
±2,C.
19
The
TEC
long counts
must
be 800 ±220.
The
TEC
short
counts
must
be
in
the
range
(0.5
x long count) +20
to -40.
Counts
outside these
ranges
indicate a
malfunction
of
the
TEC
circuit.
20
Special
Function 76
Special
function
76
continuously exercises
the
DACs
in
both
Channel
A
and
Channel
B
through the range -5.1V
to +5.1 V.
The
waveform
can be monitored
at
the
trigger
output
pins
on
the rear panel.
21
Special
Function 77
Special function 77
continuously
tests
the relays
associated with
Channel
A
input:
X1/X10
attenuators, 50fl
/lMf2
input
impedance,
DC/AC
coupling,
FILTER
and
COM
A.
The
10
MHz STD OUTPUT
from
the rear
panel
BNC
must
be
connected
to
the
Channel
A
input.
22
Special
Function 78
Special function 78
continuously
tests
the relays
associated with
Channel
B
input:
X1/X10
attenuators, 50f2
/IMfl
input
impedance and
DC/AC
coupling.
The
10
MHz
STD
OUTPUT
from
the rear
panel
BNC
must
be
connected
to the
Channel
B
input.
23
Special
Function
Error
Codes
Listed
below
in
Table
6.3
are displayed
error
codes
for
the diagnostic Special
Functions.
TABLE
6.3
Special Function Error
Codes
Display
Special
Function
Number
Error
Er 50
70 or 71
Basic
CHECK
mode
error
Er
51
7
7
X10/X1
Er
52
Input
A
50
/lm
Er 53
relay
check
i
DC/AC
Er 54
FILTER
Er 55
COM
A
Er 56
78
Input
B
X10/X1
Er 57
relay
check
<
50
/lm
Er 58
[
DC/AC
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