YOKOGAWA JUXTA MB1, User Manual

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CAUTION
● The power line and input/output signal lines should
be installed away from noise-generating sources.
Other wise accuracy cannot be guaranteed.
● Make sure to earth ground the ground terminal
through minimum resistance. The length and
thickness of the grounding cable should be as
short and thick as possible. Directly connect the
lead from the ground terminal (terminal no. 6) of
the product to the ground. Do not carry out daisy-
chained inter-ground terminal wiring.
● The product is sensitive to static electricity;
exercise care in operating it. Before you operate
the product, touch a nearby metal part to discharge
static electricity.
4. PART NAMES OF FRONT PANEL
The figure below shows the MB1 with its front panel (cover) being
open.
Zero-adjustment volume
Span-adjustment volume
Power indicator lamp
Turns on at power on.
5. MAINTENANCE
The product starts running immediately when the power is turned
on; however, it needs 10 to 15 minutes of warm-up before it
meets the specified performance.
5.1 Calibration Apparatus
• A AC voltage current standard (YOKOGAWA 2558A or the
equivalent)
• A digital multimater (YOKOGAWA DM7560 or the equivalent)
• A precision resistor of 250 Ω ± 0.01%, 1 W
5.2 Calibration Procedure
(1) Connect the instruments as shown below.
(2) Use the AC voltage current standard and apply input signals
equivalent to 0, 25, 50, 75, and 100% of the input span to the
product. Check to see the corresponding output voltages are
0, 25, 50, 75, and 100% respectively and within the specified
accuracy rating. “R” is used for current output.
• If the output signals are out of the accuracy rating range,
adjust the output signal level using the zero and span
adjustment volumes on front face of the product.
6 5 4 3
7 8 1 2
L+
N–
GND
6
7
8
1
2
R
–
+
3
4 ±
A
Power supply
Input
AC voltge
current
standard
R: 250 Ω precision resistor
for current output
DMM
Output
CT Protector
6. TRANSPORT AND STORAGE CONDITIONS
• Temperature: −25 to 70°C
• Temperature change rate: 20°C per hour or less
• Humidity: 5 to 95%RH (no condensation)
CAUTION
Keep this product in a conductive bag when plugged
out, during transport or storage.
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IM 77J04B01-01E 1st Edition