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Memory and Alarm Functions6.4 Read the Data Stored in Memory1. Press the FUNC button until a symbol of “NO.” is shown in LCD. Thecurrent record number is shown in the upper row of LCD. And the data isshown in the lower row of LCD.2. Press the ▲ or ▼ button to read the next/previous data,3. If the users hold the ▲ or ▼ button longer, the record number will beincremented/decremented faster. The record number will roll over when thelast/first record is reached.6.5 Clear Data MemoryPress and hold the REC button, then turn the power on. Letters of “CL” will be shown toindicate that memory is cleared.6.6 Cancel the Auto Power OffWhen the unit is turned on, a symbol of AP is displayed in LCD. That means the unitwill turn itself off in about 4 to 6 minutes. To cancel this function, user can hold theFUNC button, then turn the power on. Symbol of AP will not be displayed in LCD.16 HEME GEO 30SO8130Z Rev. B
Principle of Operation7 Principle of OperationThe following diagram (fig. 1) shows a simplified typical grounded distribution system.Its equivalent circuit (fig. 2) is shown below. If R 1 , R 2 , R 3 , ... R n is combined as R eq ,then only R g and R eq are left in the circuit (see figure). If a constant voltage is appliedto the circuit, the following equation is valid:UI=R g+ R eqwhere1Req = , i = 1,2,...n1∑RIf R g and R 1 , R 2 , ... R n are about the same, and n is a large number (such as 200),then R eq will be much less than R g and maybe approach zero.iRg>>eq( R → 0)Example:If R g and R 1 , R 2 , ... R n are all 10 Ω, respectively and n = 200, then R eq by calculationequalsReq= 1= 0, Ω1 1 105+ + ... +10 10 10UI= R + R = 10 + 0,05 = 10, 05 →geqRgIn this example, we can see that as long as the number of multiple electrodes is largeenough, the equivalent resistance is negligible with respect to the ground resistance tobe measured.HEME GEO 30 17SO8130Z Rev. B
Page 5: Safety Regulations1 Safety Regulati
Page 8 and 9: Description of InstrumentDisplay Fu
Page 11 and 12: Continuity Loop Test4 Continuity Lo
Page 13: Memory and Alarm Functions6 Memory
Page 18: Principle of OperationFig. 1: Typic
Page 21 and 22: SpecificationBattery ReplacementWhe
Page 23 and 24: Other Products10 Other productsLEM
Page 25 and 26: InhaltsverzeichnisInhaltsverzeichni
Page 27 and 28: Sicherheitsbestimmungen1 Sicherheit
Page 29: Mit dieser Taste werden Werte erhö
Page 34 and 35: Messung des Erdleckstroms5 Messung
Page 36 and 37: HOLDOFFSpeicher- und Alarmfunktione
Page 38 and 39: Speicher- und Alarmfunktionen6.4 Au
Page 40 and 41: ArbeitsprinzipBild 1: Typische geer
Page 42 and 43: KennwerteErdschleifenwiderstand (Au
Page 44: Wartung, Instandhaltung9 Wartung, I
Page 47 and 48: SommaireSommaire1 Règlements de s
Page 49 and 50: Règlements de sécurité1 Règleme
Page 51 and 52: Pour diminuer la valeur, appuyer su
Page 53 and 54: Mesures de résistance de terre3 Me
Page 55 and 56: Essai de continuité en boucle4 Ess
Page 57 and 58: 6 Fonctions de mémoire et d’alar
Page 59 and 60: Fonctions de mémoire et d’alarme
Page 61 and 62: Principe de fonctionnement7 Princip
Page 63 and 64: Spécification8 SpécificationSpéc
Page 65 and 66: SpécificationRemplacement de la pi
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Autres produits10 Autres produitsLE
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IndiceIndice1 Prescrizioni di sicur
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Prescrizioni di sicurezza1 Prescriz
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Pulsante REC:Descrizionequando una
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Misurazioni su circuiti di terra3 M
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4 Verifica della continuità nei ci
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Funzioni di memoria e allarme6 Funz
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6.2 Impostazione dell’intervallo
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Principio di funzionamento7 Princip
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Caratteristiche8 CaratteristicheCar
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CaratteristicheSostituzione della b
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Altri prodotti10 Altri prodottiIl g
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ÍndiceÍndice de materias1 Normas
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Normas de seguridad1 Normas de segu
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Descripción del instrumento& botó
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3 Mediciones de resistencia de tier
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4 Prueba de continuidad con buclePr
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6 Funciones de alarma y memoria6.1
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Funciones de alarma y memoria6.2 Co
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Principio de funcionamiento7 Princi
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Valores específicos8 Valores espec
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Valores específicosSustitución de
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Otro productos10 Otro productosLEM
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EC-Certificate of conformityEG-Konf
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