48NAVA
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-9442 Rev.8 P. 9 / 9
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ZERO ADJUSTMENT
1) Apply 0% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [Z].
3) Press [SET], and the bargraph shows 0%.
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SPAN ADJUSTMENT
1) Apply 100% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [S].
3) Press [SET], and the bargraph shows 100%.
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ALARM SETPOINT ADJUSTMENTS
• 48NAVA-2: H
[L setpoint] to 100%
L
0% to [H setpoint]
No alarm trip is selectable
• 48NAVA-4: HH
[H setpoint] to 100%
H
[L setpoint] to [HH setpoint]
L
[LL setpoint] to [H setpoint]
LL
0% to [L setpoint]
No alarm trip is selectable
• How to Set LL (or L, H, HH) Setpoints
1) Hold down [M] for 3 seconds* and push [M] to choose
[LL].
2) Press [UP] or [DOWN] buttons until the indicator comes
to the desired position, and press [SET].
(Same procedure for L, H, HH setpoints)
• How to Cancel HH and H Alarms
1) Press [UP] or [DOWN] buttons until the indicator comes
to the upper limit, and press [SET].
HH indicator must be set before H as the H setpoint can-
not go above the HH setpoint.
• How to Cancel LL and L Alarms
1) Press [UP] or [DOWN] buttons until the indicator comes
to the lower limit, and press [SET].
LL indicator must be set before L as the L setpoint can-
not go below the LL setpoint.
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DC OUTPUT FINE ZERO ADJUSTMENT (0%)
1) Apply 0% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [Z].
3) Press [UP] and [DOWN] buttons at once for two times
until the Z indicator changes from blinking to solid to
blinking in double speed.
4) Press [UP] or [DOWN] buttons to show a desired value at
the receiving instrument, and press [SET].
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DC OUTPUT FINE SPAN ADJUSTMENT (100%)
1) Apply 100% input signal.
2) Hold down [M] for 3 seconds* and push [M] to choose [S].
3) Press [UP] and [DOWN] buttons at once for two times
until the S indicator changes from blinking to solid to
blinking in double speed.
4) Press [UP] or [DOWN] buttons to show a desired value at
the receiving instrument, and press [SET].
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SIMULATED OUTPUT
1) Hold down [DOWN] for longer than 5 seconds to enter
the simulation mode until the Z and S indicators start
blinking.
2) Press [UP] or [DOWN] buttons to simulate a desired DC
output. Programmable from 0 to 100%.
3) Hold down [SET] for longer than 5 seconds to get out of
the simulation mode.
* The [M] button remain activated for 1 minute after it has
been used to choose a indicator LED (programming mode).
During this period, pressing the [M] button briefly is enough
to choose another indicator. After 1 minute, it turns to deac-
tivated state.
CALIBRATION PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the indication to a receiving instrument or in
case of regular calibration, adjust the output as explained
in the following.
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HOW TO CALIBRATE THE OUTPUT INDICATION
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
1) ZERO: Apply 0% input and adjust bargraph and DC out-
put to 0% following the procedure explained in “ADJUST-
MENT PROCEDURE.”
2) SPAN: Apply 100% input and adjust bargraph and DC
output and DC output to 100% following the same proce-
dure.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above proce-
dure 1) – 3).
MAINTENANCE
Regular checking procedure is explained below:
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CHECKING
Warm up the unit for at least 10 minutes. Apply 0%, 25%,
50%, 75% and 100% input signal. Check that the bargraph
and DC output for the respective input signal remains with-
in accuracy described in the data sheet. When the bargraph
and DC output are out of tolerance, recalibrate the unit ac-
cording to the “CALIBRATION PROCEDURE” explained
earlier.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protectors for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.
