Front Panel Operation Channel Menu
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-15
Whenever the limit units are active, limit checking is applied as follows: If the channel
value is greater than the high limit, and the high limit is turned ON, a FAIL is
indicated. If the channel value is below the low limit, and the low limit is ON, a FAIL is
indicated. Otherwise, if any limit is ON and a FAIL is not detected, PASS is indicated.
HIGH Limit [HLIM]
Sets the high limit. It is not necessary to enter the units as the limit value is checked
against the displayed value. Therefore, if the limits have been set for –10 dBm and the
display units are subsequently changed from dBm to Watts, the system still checks for
the reading to rise above –10, even though the display units type has been changed.
Setting a limit value automatically turns on the limit state, except when done via GPIB.
LOW Limit [LLIM]
Sets the low limit. It is not necessary to enter the units as the limit value is checked
against the displayed value.
HIGH State [HLIMS]
Select ON or OFF to enable or disable high limit checking.
LOW State [LLIMS]
Select ON or OFF to enable or disable low limit checking.
FAIL HOLD [FHOLD]
If FAIL HOLD is ON, both the screen FAIL indicator and the BNC output are held in
the fail state whenever the limits specified for the channel have been exceeded,
regardless of whether the reading subsequently goes into pass or not. This state
remains until FAIL HOLD is turned OFF.
BEEP [FBEEP]
If BEEP is ON, and FAIL HOLD is OFF, whenever the limits specified for the channel
have been exceeded, a single beep sounds.
If fail BEEP is ON and FAIL HOLD is ON, whenever the limits specified for the
channel have been exceeded, a beep will sound once every second until FAIL HOLD is
turned OFF, or the CLEAR key (CLR) is pressed.
The FAIL indication is not affected by the CLEAR key, and can only be cleared by
turning FAIL HOLD off. If a limit fail happens again, the alarm will sound again.
Table 5-4. High Limit
Units Min Max
dBm -99.99 +99.99
dBmV -53.00 147.00
dBV 7.00 207.00
Watts 0.0 50.0
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