255-250-DNDN-UL YOKOGAWA, 255-250-DNDN-UL Datasheet - Page 37

• Manufacturer Part Number: 255-250-DNDN-UL
• Description: FREQUENCY PANEL METER MODEL 255-2 55-65HZ 240VAC UL
• Manufacturer: YOKOGAWA

Specifications of 255-250-DNDN-UL

• Meter Range: 55Hz To 65Hz
• Meter Size/dimensions: 2.5" X 2.5"
• Scale Length: 2.06"
• Meter Function: Frequency

X= Available
N/A = Not Available
10. Calibration for specific frequency, 25-400 Hertz. For calibration at
11. Special terminal resistance ................................................................................
12. Red Day-Glow pointer .......................................................................................
13. Black scale with white or red pointer ................................................................
14. Special case and cover material (Refer to factory on available materials)........
15. Anti-glare window ..............................................................................................
16. ±1% FS accuracy at one point on scale.
17. Extra Hardware ..................................................................................................
18. Double rated, 3 studs (including scale) .............................................................
19. ±1% FS accuracy — all points on scale (DC with Mirror Scale — 3
20. Tachometer Voltmeter (including scale, pot & special FSV) ..............................
21. Lead length compensation pot (Millivoltmeters)................................................
22. UL 1437 Materials (2
23. External Magnetic Shield (2
24. IEC Standard 144 (IP54) (2
1. Special Scales
2. Special color on scale (black on white-std)
3. Mirror-back Scale includes knife-edge pointer (DC only)..................................
4. Nonlisted Rating.................................................................................................
5. High-sensitivity voltmeters (DC only)
6. Suppressed-zero (DC only) (20% Suppression Max.) .......................................
7. Offset-zero ratings and scale (DC only) .............................................................
8. Nonstandard lead resistance .............................................................................
9. Calibration for mounting at a specific angle......................................................
Any deviation from standard scale information on catalog listed items
constitutes a special scale.................................................................................
Each special color on scale constitutes one option..........................................
Standard sensitivity for DC voltmeters is 1000 ohms/volt
(1 milliamp current).............................................................................................
Suppressed-zero meters have greater error than standard zero-left meters.
Normally suppressed-zero units are supplied with zero adjustment. They
can be furnished with inoperable zero adjustment upon request.
Standard two-way shunt lead resistance for shunt-rated ammeters, 50 or
100 millivolt, is 0.065 ohms. Normally these meters can be used with a
wide range of lead resistances with only very small additional errors.
However, if calibration for a specific value of lead resistance other than
0.065 ohms is required, contact factory.
Special calibration not required for meters mounted 0 to 19 degrees from
vertical position.
frequencies greater than 400 Hertz, refer to factory .........................................
Normally nonstandard terminal resistance requirements or close
tolerance on terminal resistance should be referred to the factory.
(±2% FS over balance of scale).........................................................................
H.L. & Stylist Only) .............................................................................................
(Standard on AC Ammeters 20 amps or higher) ...............................................
Optional Features
1
⁄
2
-4
1
⁄
2
" only) ........................................................................
1
⁄
1
2
⁄
2
& 3
-4
1
⁄
2
1
" only)
⁄
2
B.L. only) .....................................................
Note: 1. Stylist 2
1
⁄
2
2. Horizon Line and New Big Look Only
3. Expanded Scale Voltmeter Only
and 4
1
⁄
2
1
⁄
2
"-4
New Big
Horizon
Meters
Panel
1
Look
Line
⁄
2
X
X
", HL 3
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
2
1
⁄
2
"-4
Voltmeters
Frequency
Expanded
Scale
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
and
1
X
X
⁄
2
X
X
X
X
X
X
X
X
X
X
X
X
"
1
3
Stylist
Series
N/A
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
Edgewise
and 280
N/A
N/A
N/A
N/A
N/A
N/A
N/A
185
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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