Omega-vehicle-security HH-21 Manuel d'utilisateur

8BATTERY INSTALLATION/REPLACEMENTA 9V battery is supplied with the instrument but not installed. Read the fol-lowing installation instructions before

10MEMORY BACKUPDuring battery replacement, the contents of user-programmed memory(data, operating modes, etc.) can be saved. Prior to removing the old

11Display reads (1) No thermocouple or a damaged ther-mocouple is plugged into the selectedinput.NOTE: When viewing T1-T2, theremust be a thermocouple

122. Record AnnunciatorA flashing record symbol adjacent to a corresponding input selectionannunciator indicates that this channel is being recorded.

1310. HOLD Hold AnnunciatorThis symbol will indicate that the instrument display is on hold.11. SCAN Scan AnnunciatorThis annunciator will be displaye

14The DISPLAY RESOLUTION key selects whether the tempera-ture readings will be displayed in high resolution (0.1°C or °F) orlow resolution (1°C or °F)

15NOTE: The thermometer will display “OPEN” onany selected channel that does not have athermocouple plugged in or if the thermo-couple is open-circuit

16With the thermometer in either the T1, T2, or T1-T2 mode, corre-sponding MIN/MAX data can be viewed. To view MIN/MAX data,first select T1, T2, or T1

17Recording in one or more of the three measurement modes T1,T2, and T1-T2 can be stopped with this key. Before pressing CLRthis key, select the appro

18SERVICE INFORMATIONWARNINGAll service information is intended for qualified electronicmaintenance personnel only.1. CALIBRATION PROCEDURETest Equipm

1912. Wait for U.U.T. readout to stabilize, then press HOLD key once, and waita few seconds. U.U.T. should read 32.0°F ±0.5°F, type J.13. Set calibrat

20Re-assemble the instrument by following the reverse of the above procedure.CAUTIONDo not use excessive torque when re-installing the nylonmachine-sc

224. COMPONENT LAYOUT

23SchematicDesignation* Description Part NumberC1, 2, 17 Capacitor, Polyester C-344-.1C3, 9, 10 Capacitor, Aluminum C-513-33C4, 8, 11, 13, 14 Capacito

24SchematicDesignation* Description Part Number*U9 I.C., Schmitt Inv. IC-834U11 I.C., LCD Controller IC-761U12 I.C., EEPROM IC-851U13 (3) I.C., Microc

256. SCHEMATIC DIAGRAMS1. Signal Conditioning and A/D

262. Microcomputer and Display

273. Power Supply

1TABLE OF CONTENTSGeneral Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Specifications . . . . . . . . . .

2GENERAL INFORMATIONThis manual provides information on the use of three digital handheld ther-mometers. Functional features both common and unique to

3MAXIMUM COMMON MODE VOLTAGE: 42V peak to earth.POWER: 9 volt transistor battery (NEDA 1604).BATTERY LIFE, CONTINUOUS: 50 hrs typical, carbon-zinc;

4DIFFERENCE SPECIFICATIONSMODEL HH-21:THERMOCOUPLE INPUTS: 1DISPLAY: 5 digit LCD, 0.4" height. Polarity indication, and decimal point.Annunciato

5FEATURES• Temperature trend indication (rising, falling, or stable)• Full range resolution of 0.1 degree• Work with thermocouple types K, J and T• Kp

6SAFETY INFORMATIONSAFETY SYMBOLS AND TERMSThe symbol on the instrument denotes that the user should refer to theoperating instructions.The WARNING u

7WARNINGDo not substitute a metal part for the nylon screw in therear case. Doing so will degrade electrical isolation of thecase.WARNINGThe battery i